Inclusion of rename organization api (#33303)

This adds an endpoint (`/orgs/{org}/rename`) to rename organizations.

I've modeled the endpoint using the rename user endpoint --
`/admin/users/{username}/rename` -- as base.

It is the 1st time I wrote a new API endpoint (I've tried to follow the
rename users endpoint code while writing it). So feel free to ping me if
there is something wrong or missing.

Resolves #32995

---------

Signed-off-by: Bruno Sofiato <bruno.sofiato@gmail.com>
Co-authored-by: delvh <dev.lh@web.de>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
(cherry picked from commit 040c830dec5c727a56d16df62b1673bce6fca645)

Conflicts:
	routers/api/v1/admin/user.go
  ignore this unrelated change
	templates/swagger/v1_json.tmpl
  regenerate
	tests/integration/api_org_test.go
  port as a standalone test instead of refactoring the tests

tests/integration/api_org_test.go

@@ -99,6 +99,29 @@ func TestAPIOrgCreate(t *testing.T) {
 	assert.EqualValues(t, "user1", users[0].UserName)
 }
 
+func TestAPIOrgRename(t *testing.T) {
+	defer tests.PrepareTestEnv(t)()
+	token := getUserToken(t, "user1", auth_model.AccessTokenScopeWriteOrganization)
+
+	org := api.CreateOrgOption{
+		UserName:    "user1_org",
+		FullName:    "User1's organization",
+		Description: "This organization created by user1",
+		Website:     "https://try.gitea.io",
+		Location:    "Shanghai",
+		Visibility:  "limited",
+	}
+	req := NewRequestWithJSON(t, "POST", "/api/v1/orgs", &org).
+		AddTokenAuth(token)
+	MakeRequest(t, req, http.StatusCreated)
+
+	req = NewRequestWithJSON(t, "POST", "/api/v1/orgs/user1_org/rename", &api.RenameOrgOption{
+		NewName: "renamed_org",
+	}).AddTokenAuth(token)
+	MakeRequest(t, req, http.StatusNoContent)
+	unittest.AssertExistsAndLoadBean(t, &org_model.Organization{Name: "renamed_org"})
+}
+
 func TestAPIOrgEdit(t *testing.T) {
 	defer tests.PrepareTestEnv(t)()
 	session := loginUser(t, "user1")